| /* |
| Copyright 2005-2010 Intel Corporation. All Rights Reserved. |
| |
| This file is part of Threading Building Blocks. |
| |
| Threading Building Blocks is free software; you can redistribute it |
| and/or modify it under the terms of the GNU General Public License |
| version 2 as published by the Free Software Foundation. |
| |
| Threading Building Blocks is distributed in the hope that it will be |
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
| of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with Threading Building Blocks; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| As a special exception, you may use this file as part of a free software |
| library without restriction. Specifically, if other files instantiate |
| templates or use macros or inline functions from this file, or you compile |
| this file and link it with other files to produce an executable, this |
| file does not by itself cause the resulting executable to be covered by |
| the GNU General Public License. This exception does not however |
| invalidate any other reasons why the executable file might be covered by |
| the GNU General Public License. |
| */ |
| |
| /* |
| The original source for this example is |
| Copyright (c) 1994-2008 John E. Stone |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| 1. Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| 3. The name of the author may not be used to endorse or promote products |
| derived from this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
| OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| SUCH DAMAGE. |
| */ |
| |
| /* |
| * camera.c - This file contains all of the functions for doing camera work. |
| * |
| * $Id: camera.cpp,v 1.1.1.1 2012/03/29 17:22:19 uid42307 Exp $ |
| */ |
| |
| #include "machine.h" |
| #include "types.h" |
| #include "macros.h" |
| #include "vector.h" |
| #include "camera.h" |
| #include "util.h" |
| |
| ray camray(scenedef *scene, int x, int y) { |
| ray ray1, newray; |
| vector projcent; |
| vector projpixel; |
| flt px, py, sx, sy; |
| |
| sx = (flt) scene->hres; |
| sy = (flt) scene->vres; |
| |
| /* calculate the width and height of the image plane given the */ |
| /* aspect ratio, image resolution, and zoom factor */ |
| |
| px=((sx / sy) / scene->aspectratio) / scene->camzoom; |
| py=1.0 / scene->camzoom; |
| |
| /* assuming viewvec is a unit vector, then the center of the */ |
| /* image plane is the camera center + vievec */ |
| projcent.x = scene->camcent.x + scene->camviewvec.x; |
| projcent.y = scene->camcent.y + scene->camviewvec.y; |
| projcent.z = scene->camcent.z + scene->camviewvec.z; |
| |
| /* starting from the center of the image plane, we move the */ |
| /* center of the pel we're calculating, to */ |
| /* projcent + (rightvec * x distance) */ |
| ray1.o=projcent; |
| ray1.d=scene->camrightvec; |
| projpixel=Raypnt(&ray1, ((x*px/sx) - (px / 2.0))); |
| |
| /* starting from the horizontally translated pel, we move the */ |
| /* center of the pel we're calculating, to */ |
| /* projcent + (upvec * y distance) */ |
| ray1.o=projpixel; |
| ray1.d=scene->camupvec; |
| projpixel=Raypnt(&ray1, ((y*py/sy) - (py / 2.0))); |
| |
| /* now that we have the exact pel center in the image plane */ |
| /* we create the real primary ray that will be used by the */ |
| /* rest of the system. */ |
| /* The ray is expected to be re-normalized elsewhere, we're */ |
| /* only really concerned about getting its direction right. */ |
| newray.o=scene->camcent; |
| VSub(&projpixel, &scene->camcent, &newray.d); |
| newray.depth = scene->raydepth; |
| newray.flags = RT_RAY_REGULAR; /* camera only generates primary rays */ |
| |
| return newray; |
| } |
| |
| |